Expansible collapsible tire-core.



L. GREENWALD. EXPANSIBLE GOLLAPSIBLE TIRE GORE. APPLIOAIION FILED APR. 18, 1913.

Patented Aug. 11, 1914.

- cruise s ra rns earner "New e is use,

IZEMOII G'EEENWALD,-OF AKRON, OHIO, ASSIGNOR TO THE FIRESIEONE TIRE :51;

RUBBER COMPANY, OF AKRON,

OHIO, A CORPORATIGN 01' OHIO.

Y EXPANSIZBLE COLLAPSIBLE TIRE-CORE.

Specification of Letters Patent.

Application filed April is, 1913. Serial No. 761,920.

To all whom it may concern Be it known that I, LEMON GREnNw-Ano, a citizen of the United States, residing at Akron, in the county of Summit and State of ()hio, have invented certain new and useful Improvements in Expansible Collapsible Tire-Cores, of which the following" is a specification.

In the curing of pneumatic tire shoes or during the process of manufacture,the case is supported upon an inner core which holds the same distended and in proper shape; also in the repair and particularly the vulcanization of tire cases'which have become injured in use, the employment of a core is necessary to hold the tire firmly during treatment-. Inflatable air bags have been used in this connection as also have wire coils, but the former practice is open to the objection that the bags are subject to leakage and consequent loss of firmness, and also that the bags intervene to shield the inner fabric of the case from the vulcanizing heat, While the use of wire coils is objectionable, both because the material of the case is not supported immediately over the spaces between thewires and also because the wire coil permits the steam to come into direct contact with and injure the inner fabricof thecase. I avoid all these objections and provide a firm, light, collapsible core which supports the case uniformly throughout and protects the fabric from the moisture of the steam while not interfering with the application of the heat thereto.

My improved collapsible core also provides for variations in size whereby to adapt the one core to all tire cases of a general exterior size but of different types, the regular clencher tire being of smaller interior dimensions than the quick detachable clencher and the straight side types of tires. This adaptability is attained bythe employment in connection with the core sections. of shims or distance plates interposed between the adj acentends of such. sections.

in order that the invention may be readily understood, a preferred embodiment of the same is set forth in the accompanying-drawing and' in the detailed description predicated thereon. As the invention is, however, capable of embodiment in other and varied constructional forms, the drawing and. description are to be taken in an illustrative and not in an unnecessarily limiting sense. V

In the drawing, Figure 1, is a side elevation of the core assembled, with certain parts broken away to show the interior construe tion; Fig. 2 is a central median section through the assembled core; and F 3 is a transverse section through one of the core elements.

Having reference to the several figures of the drawing, the core is shown as composed of four sections or segments 11, 12, 13 and 14 which are complementary one to another. Obviously the number may be increased or diminished to a minimum of three without affecting the invention. The segmentsll and 13 are advantageously separated from the interposed segment 12 upon radial division line 15, 15, while they are separated from interposed segment 1 1 upon non-par- -allcl inwardly diverging division lines 16, 16, such that the are forming the inner wall of the segment l-l is but slightly greater than the are forming the outer wall of said segment and, preferably, to the extent of about 1. inches. This enables the assembling of the collapsible core within the tire casing by inserting the three segments 11, I2 and 13 in proper relation and then finally slipping the segment 14 into the casing between the segments 11 and 13 in a radial direction, while the other segments are wedgedapart to completely fill the casing.

In order to adapt the sectional core for use in connection with tire casings of a type having a slightly greater interior dimension, I provide the end faces of the two segments 12 and 14 with recesses or sockets 17, 17 which are without function when the core is assembled for use in the smaller type of easings indicated in Fig. 1, but which recesses are adapted to receive dowel pins 18, 18 of shims or distance plates 19, whereby the effective length of each of the segments 12 and 14 is increased for assembling for use in connection with tires of the larger type as indicated in Fig.2.

Each of the segments is preferably provided in its inner wall with an opening I 20, which places the interior of the hollow segment in open connection with the atmosphere, which provision enables the steam to enter the segments and to subject the interior of the tire casing to substantially the same degree of heat as theexterior thereof, whileat the same time protecting the interior fabric against injury from direct contact with the moisture of the steam.

I claim: I l. A collapsible tire core composed of segments, distance plates interposed between the adjacent end faces of the segments, and means to hold the distance plates in proper assembled relation to certain of the'segments' A collapsible tire core composed of segments, tween the adjacent end faces of the segments, the distance plates and segments provided with interen gaging members.

' 3. A collapsiblev tire core composed of segments, and distance plates interposed be tween the adjacent end faces of thesegments, the distance plates having pin and socket engagement with certain of the segments.

4. A collapsible tire core composed of segments, tween the adjacent end faces of the seg-- -men'ts, I

pins and certain of the segments with reand distance plates interposed bedistance plates provided with cesses for the reception of the pins.

LA collapsible tire core composed of hOllow segments, the several segments having openings communicating between the and distance plates interposed be-' interior and the atmosphere, and distance 7 plates interposed between the adjacent end faces of the segments, the distance plates 7. A collapsible tire core composed of hollow segments, the several segments'having openings communicating between the interior and the atmosphere, and dlstance plates interposed between the adjacent end.

faces of the segments, the distance plates provided with pins and certain of the segpins.

8. An expansible and contractible' collapsible tire core. composed of several detachable segments and, distance pieces rements with recesses for the reception of the movably interposedbetween adjacent ends of said segments permitting the sides of the core to be varied, the d stance plates and segments provided with interengaging members.

Inwitness whereof I have hereunto. set

my hand in the presence of two witnesses.

, LEMON GREENWALD. .Witnesses:

,S. G. CaascHUFr,

E; M HAHN, 

